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Comparison of field and laboratory spectro-directional measurements using a standard artificial target


Schopfer, Juerg T; Dangel, Stefan; Kaiser, Johannes W; Kneubühler, Mathias; Nieke, Jens; Schaepman-Strub, Gabriela; Schaepman, Michael E; Itten, Klaus I (2004). Comparison of field and laboratory spectro-directional measurements using a standard artificial target. In: Sensors, Systems, and Next-Generation Satellites VIII, Maspalomas, Gran Canaria, Spain, 13 September 2004 - 15 September 2004, 626-633.

Abstract

Spectro-directional surface measurements can either be performed in the field or within a laboratory setup. Laboratory measurements have the advantage of constant illumination and neglectable atmospheric disturbances. On the other hand, artificial light sources are usually less parallel and less homogeneous than the clear sky solar illumination. To account for these differences and for determining for which targets a replacement of field by laboratory experiments is indeed feasible, a quantitative comparison is a prerequisite. Currently, there exists no systematic comparison of field and laboratory measurements using the same targets. In this study we concentrate on the difference in spectro-directional field and laboratory data of the same target due to diffuse illumination. The field data were corrected for diffuse illumination following the proposed procedure by Martonchik . Spectro-directional data were obtained with a GER3700 spectroradiometer. In the field, a MFR sun photometer directly observed the total incoming diffuse irradiance. In the laboratory, a 1000W brightness-stabilized quartz tungsten halogen lamp was used. For the first direct comparison of field and laboratory measurements, we used an artificial and inert target with high angular anisotropy. Analysis shows that the diffuse illumination in the field is leading to a higher total reflectance and less pronounced angular anisotropy.

Abstract

Spectro-directional surface measurements can either be performed in the field or within a laboratory setup. Laboratory measurements have the advantage of constant illumination and neglectable atmospheric disturbances. On the other hand, artificial light sources are usually less parallel and less homogeneous than the clear sky solar illumination. To account for these differences and for determining for which targets a replacement of field by laboratory experiments is indeed feasible, a quantitative comparison is a prerequisite. Currently, there exists no systematic comparison of field and laboratory measurements using the same targets. In this study we concentrate on the difference in spectro-directional field and laboratory data of the same target due to diffuse illumination. The field data were corrected for diffuse illumination following the proposed procedure by Martonchik . Spectro-directional data were obtained with a GER3700 spectroradiometer. In the field, a MFR sun photometer directly observed the total incoming diffuse irradiance. In the laboratory, a 1000W brightness-stabilized quartz tungsten halogen lamp was used. For the first direct comparison of field and laboratory measurements, we used an artificial and inert target with high angular anisotropy. Analysis shows that the diffuse illumination in the field is leading to a higher total reflectance and less pronounced angular anisotropy.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Event End Date:15 September 2004
Deposited On:08 Jul 2014 16:15
Last Modified:11 Aug 2017 12:02
Publisher:SPIE - International Society for Optical Engineering
Series Name:Proceedings of SPIE
ISSN:0277-786X
Free access at:Official URL. An embargo period may apply.
Publisher DOI:https://doi.org/10.1117/12.585555
Official URL:http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=851039
Related URLs:http://adsabs.harvard.edu/abs/2004SPIE.5570..626S

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